4 elemenets= fire, water, air, earth *John Dalton-Teacher ( late 1700)
summarized results of his experiments and those of others *Dalton's Atomic Theory
1.) All matter is made of tiny indivisible particles called atoms
2.) Atoms of the same element are identical, those of diffrent elements are diffents
3.)Atoms of diffrent combine in whole number ratios to form ccompounds
4.) Chemical reactions involve the rearrangement of atoms. No new atoms are created or destroyed
Parts of the Atom
*J.J. Thompson-English Physicist (1897)
made a piece of equipment called a carthode ray tube. It is a vacuum tube which means all the air has been pumped out
*Proton- postively charged pieces that are 1840 times heavier than the electron- by E. Goldstein
*Neutron- no charge but the same mass as a proton- by J. Chadwick
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- Orginal idea Ancient Greece (400 B.C)
- Democritus and Leucippus-Greek philosphers
- Aristole-famous philospher
4 elemenets= fire, water, air, earth*John Dalton-Teacher ( late 1700)
summarized results of his experiments and those of others
*Dalton's Atomic Theory
1.) All matter is made of tiny indivisible particles called atoms
2.) Atoms of the same element are identical, those of diffrent elements are diffents
3.)Atoms of diffrent combine in whole number ratios to form ccompounds
4.) Chemical reactions involve the rearrangement of atoms. No new atoms are created or destroyed
Parts of the Atom
*J.J. Thompson-English Physicist (1897)
made a piece of equipment called a carthode ray tube. It is a vacuum tube which means all the air has been pumped out
*Proton- postively charged pieces that are 1840 times heavier than the electron- by E. Goldstein
*Neutron- no charge but the same mass as a proton- by J. Chadwick
Rutherfords Model of the Atom
Electromagnetic Radiation
Wavelength
Wavelength is large-energy is small
Wavelength is small-energy is large
Frequency --> how many times
a period of time
Spectroscopes: instruments used to measure the behaviour of radiation
Bohr Model of Atom
Ground State Electrons: electrons in the lowest energy level
Drawback of Rutherford Model of Atoms
1) The atom is not stable due to continuous emission of radiation(EMR)
2) Cannot explain the line spectra of Hydrogen like atoms
Quantised: Fixed Energy
Every orbit(shell or energy level) has a fixed value for its energy
(It will not change).
Energy will be absorbed or emitted in discrete quantities.